<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>shell 元字符转义</title>
 </head>
 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.escapeshellcmd" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">escapeshellcmd</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">escapeshellcmd</span> &mdash; <span class="dc-title">shell 元字符转义</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.escapeshellcmd-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>escapeshellcmd</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$command</code></span>
   ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>escapeshellcmd()</strong></span> 对字符串中可能会欺骗 
   shell 命令执行任意命令的字符进行转义。
   此函数保证用户输入的数据在传送到 
   <span class="function"><a href="exec.html" class="function">exec()</a></span> 或
   <span class="function"><a href="system.html" class="function">system()</a></span> 函数，或者 <a href="language.operators.execution.html" class="link">执行操作符</a> 之前进行转义。
  </p>
  <p class="para">
    反斜线（\）会在以下字符之前插入：
   <em>&amp;#;`|*?~&lt;&gt;^()[]{}$\</em>, <em>\x0A</em>
   和 <em>\xFF</em>。 <em>&#039;</em> 和 <em>&quot;</em>
   仅在不配对儿的时候被转义。
   在 Windows 平台上，所有这些字符以及 <em>%</em> 和 <em>!</em> 字符都会被空格代替。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.escapeshellcmd-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">command</code></dt>

     <dd>

      <p class="para">
        要转义的命令。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.escapeshellcmd-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   转义后的字符串。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.escapeshellcmd-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4358">
    <p><strong>Example #1 <span class="function"><strong>escapeshellcmd()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;我们故意允许任意数量的参数<br /></span><span style="color: #0000BB">$command&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'./configure&nbsp;'</span><span style="color: #007700">.</span><span style="color: #0000BB">$_POST</span><span style="color: #007700">[</span><span style="color: #DD0000">'configure_options'</span><span style="color: #007700">];<br /><br /></span><span style="color: #0000BB">$escaped_command&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">escapeshellcmd</span><span style="color: #007700">(</span><span style="color: #0000BB">$command</span><span style="color: #007700">);<br />&nbsp;<br /></span><span style="color: #0000BB">system</span><span style="color: #007700">(</span><span style="color: #0000BB">$escaped_command</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.escapeshellcmd-notes">
   <div class="warning"><strong class="warning">Warning</strong>
    <p class="para">
     <span class="function"><strong>escapeshellcmd()</strong></span> 应被用在完整的命令字符串上。
     即使如此，攻击者还是可以传入任意数量的参数。
     请使用 <span class="function"><a href="escapeshellarg.html" class="function">escapeshellarg()</a></span> 函数
     对单个参数进行转义。
    </p>
   </div>
 </div>

 
 <div class="refsect1 changelog" id="refsect1-function.escapeshellcmd-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.4.43, 5.5.27, 5.6.11</td>
       <td>
        感叹号会被空格所替换。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>

 
 <div class="refsect1 seealso" id="refsect1-function.escapeshellcmd-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="escapeshellarg.html" class="function" rel="rdfs-seeAlso">escapeshellarg()</a> - 把字符串转码为可以在 shell 命令里使用的参数</span></li>
    <li class="member"><span class="function"><a href="exec.html" class="function" rel="rdfs-seeAlso">exec()</a> - 执行一个外部程序</span></li>
    <li class="member"><span class="function"><a href="popen.html" class="function" rel="rdfs-seeAlso">popen()</a> - 打开进程文件指针</span></li>
    <li class="member"><span class="function"><a href="system.html" class="function" rel="rdfs-seeAlso">system()</a> - 执行外部程序，并且显示输出</span></li>
    <li class="member"><a href="language.operators.execution.html" class="link">执行运算符</a></li>
   </ul>
  </p>
 </div>

</div></div></div></body></html>